Filter-bag-attaching device



March 12, 1940. P. RABATIN 2,193,778

FILTER-BAG-ATTACHING DEVICE Filed July 15, 1938 UIUIUUUI INVENTOR.

TTORNEYS Patented Mar. v1940 r rest OFFICE 'FILTER-BAG-ATTAOHING DEVICE .Paiiliitabatin, Kent, Ohio, assignor to The Black & "porationoif Ohio Decker Electric Company, Kent, Ohio, a cor- Amie-aim.- July 15,1938, Serial No. 219,430

2 Claims.

This invention relates to filtering bags for vacuum cleaners, and more particularly to the manher of attaching and detaching the bag to the suction device. I S An object of my invention is to provide a quickly applied filter bag attaching and holding device, which will serve to maintain an open end of the bag in sealed relationship. to the suction apparatus.

A further object of my invention is the provision of a simple filter bag attaching device, which may be readily inserted in the hem of the bag, and thereafter with the bag, be attached to the suction device, in such a manner as to withstand 5 a substantial longitudinal pull or stress exerted mechanically upon the bag.

Other objects of my invention will be summarized in the claims.

In the drawing, in Fig. 1 I show in cross-section an adaptation of my invention to a commercial form of vacuum cleaner; Fig. 2 is a somewhat diagrammatical illustration of the bagattaching device, showing the form of the same when ready for insertion inthe hem of the bag,

2:5 but before the bag is attached to the vacuum filtering bag to a vacuum cleaner of a commercial type, such as is disclosed in the Cole Patent No. 2,116,233, issued May 3rd, 1933, to my assignee.

I In this type of vacuum cleaner, it is highly desirable to have the filter bag stretched taut, and preferably in cylindrical form. Generally such a vacuum cleaner comprises a base In, an outer casing I I mounted on the base, a casing closurememher or closure lid I2 and a motor-driven suction unit I3 carried by the lid I2 and disposed within the filtering bag I l. A suction inlet connection to the casing is generally indicated at I5 and a top guard I6 surmounts the closure lid I2. Movement of air through the device is indicated by the arrows.

The filtering bag. I4 is maintained in a stretched or taut condition to prevent collapsing of the same inwardly toward the suction unit I3, and in the illustration given this is accomplished by three helical spring members I8, mounted upon posts I9, which are attached to and depend from the closure lid member I2, exteriorally of the bag. The lower ends of the spring members I8 react 56 against lugs 20, formed upon or attached to a lower metallic ring member 2 I, and washer members 22, carried by the postsI9. The washer I members react upwardly against removable pins 23, extending through the posts. The lower ring ZI is secured to another metallic ring 24, disposed interiorally of the bag. I

The upper end of the bag is provided with a hem 25, and the perimeter thereof is adapted to engage, in an annularly formed, grooved flange portion 26 of the closure lid I2, and which flange is disposed immediately adjacent the posts I9.

Various bag-attachingdevices have been utilized to secure the open end of filter bags to vacuum cleaner casings, such as elastic bands, in the form of so-called garter springs, clamping bands, cords, etc., to hold the end of the bag in suction tight relationship to some part of the cleaner casing. The usual elastic means, such as a garter springinserted in the hem of the bag, have been found unsatisfactory, due to the fact that when the cylindrical wall of the bag is maintained under sufficient tautness to efficiently function as a dust-filtering membrane, the upper end of the bag frequently becomes detached from the cleaner casing. On the other hand, when the use of positive annular clamping means is resorted to, facility in rapid changing of the bag for renewal and for cleaning purposes, is impaired.

I have devised a very simple bagattaching means which may comprise, as shown, in Figs. 2 and 3, a single stretch of spring wire, such as a good grade of piano wire, which can be cheaply and readily formed into the hoop shape 3%, illustrated in Fig. 2, having free end extensions 32a and 33a with a coil spring SI formed on the extension 33a to be disposed exteriorally of the hem of the bag when the hoop portion Eta thereof is threaded through the hem of the bag.

In the particular form of the bag-securing means shown, the overall length thereof is such that the ends thereof terminate in hook formations, as indicated at 32 and 33, whereby one end may be attached to one of the post members iii and the other end 33 attached to a post member by inserting a pull on. the hook end 33, to cause elongation of the overall length of the wire by tensioning or stretching the coil spring section 3! thereof, as shown in Fig. 3. I I

It will be apparent that while the attaching means can be very simple in construction, nevertheless when attached to the bag with the hoop section 30a disposed within the bag hem and the stretches 32a, 33a and coil spring section 3i exteriorally disposed of, the hem and under the tensioned condition illustrated in Fig. 3, the upper end of the bag will be firmly held in contact with the closure lid flange 26, uniformly around the perimeter of the hem in opposition to the bagstretching action of the spring members [8. The hoop section of the device can be quickly threaded into the hem of the bag and the convenient attaching and detaching characteristics thereof will be apparent to those skilled in the art.

The securing action of the device is such that a uniform annular snubbing and tightening force is exerted upon the bag under all operating conditions.

I claim:

1. A vacuum cleaner bag-attaching means, comprising an open end hoop formation of wire, adapted to engage within the hem of an open end of a vacuum cleaner bag and provided with extensions adapted to be disposed exteriorly of the bag hem and provided with hook-shaped ends and a hoop-tensioning means connected with one of said extensions exteriorly of the bag hem, whereby the open end hoop portion of the device may be uniformly annularly tensioned against the bag end.

2. An attaching means for a vacuum cleaner bag comprising a single stretch of spring wire having an annularly formed section adapted to engage within a hem end of the filter bag, and having extensions thereon provided with hookshaped ends adapted to be disposed exteriorly of the hem end and to engage the vacuum cleaner mechanism and one of said extensions having a contractive coil spring formation, which, when expanded and with the ends of the device attached to the vacuum cleaner, serves to exert a substantially uniform annular tension interiorly and exteriorly of the filter bag hem.

PAUL RABA'I'IN. 

